gma500: Mask out bits not part of the page table base address
Otherwise we can't ioremap the gtt and the screen gets garbled. Signed-off-by: NPatrik Jakobsson <patrik.r.jakobsson@gmail.com> Signed-off-by: NAlan Cox <alan@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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